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Employee Benefits (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic benefit costs for 2019 and 2018 are as follows:
 
Three Months Ended
June 30
 
Six Months Ended
June 30
 
2019
 
2018
 
2019
 
2018
 
(Millions of dollars)
Pension Benefits
 
 
 
 
 
 
 
United States
 
 
 
 
 
 
 
Service cost
$
102

 
$
120

 
$
203

 
$
240

Interest cost
99

 
93

 
198

 
185

Expected return on plan assets
(141
)
 
(159
)
 
(282
)
 
(318
)
Amortization of prior service costs (credits)
1

 
—

 
1

 
1

Amortization of actuarial losses (gains)
59

 
76

 
119

 
152

Settlement losses
60

 
66

 
120

 
132

Total United States
180

 
196

 
359

 
392

International
 
 
 
 
 
 
 
Service cost
36

 
33

 
71

 
73

Interest cost
53

 
60

 
104

 
106

Expected return on plan assets
(57
)
 
(65
)
 
(115
)
 
(131
)
Amortization of prior service costs (credits)
3

 
4

 
6

 
6

Amortization of actuarial losses (gains)
6

 
6

 
11

 
17

Settlement losses
—

 
—

 
1

 
—

Total International
41

 
38

 
78

 
71

Net Periodic Pension Benefit Costs
$
221

 
$
234

 
$
437

 
$
463

Other Benefits*
 
 
 
 
 
 
 
Service cost
$
9

 
$
8

 
$
18

 
$
21

Interest cost
24

 
27

 
48

 
48

Amortization of prior service costs (credits)
(7
)
 
(7
)
 
(14
)
 
(14
)
Amortization of actuarial losses (gains)
—

 
3

 
(1
)
 
7

Net Periodic Other Benefit Costs
$
26

 
$
31

 
$
51

 
$
62

_ ___________________________________
* Includes costs for U.S. and international OPEB plans. Obligations for plans outside the United States are not significant relative to the company’s total OPEB obligation.